Fungicidal mixtures

Abstract

Fungicidal compositions comprising an acceptable carrier and/or surface active agent and synergistically effective amounts of(a) at least one azolopyrimidine of formula I in whichR1, R2, L1, L2 and L3 have the meaning given in claim 1; and(b) at least one fungicidal active ingredient selected from benomyl, carboxin, captan, chlorothalonil, copper oxychloride, cyprodinil, dimethomorph, dithianon, dodine, famoxadone, fenhexamid, fenpiclonil, fenpropimorph, fluazinam, mancozeb, metalaxyl, pyrimethanil, quinoxifen, sulfur, triforine, vinclozolin, a fungicidal triazole derivative, and a synthetic strobilurine derivative. The invention also provides a method of controlling the growth of phytopathogenic fungi at a locus by applying synergistically effective amounts of at least one azolopyrimidine of formula I and at least one fungicidal active ingredient (b) to the locus.

What is claimed is:  
     
       1. A fungicidal composition comprising a fungicidally acceptable carrier and/or surface active agent and, as active components, 
       (a) at least one azolopyrimidine of formula I                    
        in which  
       R 1  represents a C 1-6  alkyl, C 3-6  alkenyl or C 1-6  haloalkyl group, and  
       R 2  represents a hydrogen atom or a C 1-6  alkyl group, or  
       R 1  and R 2  taken together represent a C 3-8  alkylene group;  
       L 1  represents a halogen atom; and  
       L 2  and L 3  each independently represent a hydrogen or a halogen atom; and  
       (b) at least one fungicidal active ingredient selected from the group of fungicidal triazoles;  
       wherein the active components are present in synergistically effective amounts. 
     
     
       2. The composition defined in  claim 1 , wherein the group of fungicidal triazoles consists of cyproconazole, epoxiconazole, metconazole, propiconazole and tebuconazole. 
     
     
       3. The composition defined in  claim 1 , wherein the moiety                    
     
     
       4. The composition defined in  claim 3 , wherein the azolopyrimidine is selected from the group consisting of: 
       5-chloro-6-(2-chloro-6-fluorophenyl)-7-(4-methylpiperid-1-yl)[1,2,4]triazolo[1,5-a]pyrimidine,  
       5-chloro-6-(2-chloro-6-fluorophenyl)-7-(2,2,2-trifluoroethylamino)[1,2,4]triazolo[1,5-a]pyrimidine, and  
       5-chloro-6-(2,4,6-trifluorophenyl)7-(1,1,1-trifluoroprop-2-ylamino)[1,2,4]triazolo[1,5-a]pyrimidine.  
     
     
       5. The composition defined in  claim 1 , which comprises the active component (b) and the active component (a) in a weight ratio of approximately from 0.01:1 to 100:1. 
     
     
       6. A method of controlling the growth of phytopathogenic fungi at a locus which comprises applying an effective amount of 
       (a) at least one azolopyrimidine of formula I                    
        in which  
       R 1  represents a C 1-6  alkyl, C 3-6  alkenyl or C 1-6  haloalkyl group, and  
       R 2  represents a hydrogen atom or a C 1-6  alkyl group, or  
       R 1  and R 2  taken together represent a C 3-8  alkylene group;  
       L 1  represents a halogen atom; and  
       L 2  and L 3  each independently represent a hydrogen or a halogen atom; and  
       (b) at least one fungicidal active ingredient selected from the group of fungicidal triazoles;  
       to the locus, wherein components (a) and (b) are applied in synergistically effective amounts. 
     
     
       7. The method of  claim 6 , wherein the phytopathogenic fungi are selected from the group of wheat leaf rust, wheat Septoria leaf blotch and wheat powdery mildew. 
     
     
       8. The composition defined in  claim 1 , wherein the group of fungicidal triazoles consists of compounds of formula II                    
       wherein 
       L represents a linking group of formula (a), (b), (c) or (d)                    
        in which  
       X 1  is an alkyl or an optionally substituted phenyl group,  
       X 2  and X 3  are independently a hydrogen atom or an alkyl group,  
       X 4  is an alkyl or cyclopropylalkyl group, and  
       n is 0 or 2; and  
       q is 1 or 2.  
     
     
       9. The composition defined in  claim 8 , wherein the moiety                    
     
     
       10. The composition defined in  claim 9 , wherein the azolopyrimidine is selected from the group consisting of: 
       5-chloro-6-(2-chloro-6-fluorophenyl)-7-(4-methylpiperid-1-yl)[1,2,4]triazolo[1,5-a]pyrimidine,  
       5-chloro-6-(2-chloro-6-fluorophenyl)-7-(2,2,2-trifluoroethylamino)[1,2,4]triazolo[1,5-a]pyrimidine, and  
       5-chloro-6-(2,4,6-trifluorophenyl)-7-(1,1,1-trifluoroprop-2-ylamino)[1,2,4]triazolo[1,5-a]pyrimidine.  
     
     
       11. The composition defined in  claim 8 , which comprises the active component (b) and the active component (a) in a weight ratio of approximately from 0.01:1 to 100:1. 
     
     
       12. The method of  claim 6 , wherein the group of fungicidal triazoles consists of compounds of formula II                    
       wherein 
       L represents a linking group of formula (a), (b), (c) or (d)                    
        in which  
       X 1  is an alkyl or an optionally substituted phenyl group,  
       X 2  and X 3  are independently a hydrogen atom or an alkyl group,  
       X 4  is an alkyl or cyclopropylalkyl group, and  
       n is 0 or 2; and  
       q is 1 or 2.